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argon2id.py
# Copyright 2013 Donald Stufft and individual contributors # # Licensed under the Apache License, Version 2.0 (the "License"); # you may not use this file except in compliance with the License. # You may obtain a copy of the License at # # http://www.apache.org/licenses/LICENSE-2.0 # # Unless required by applicable law or agreed to in writing, software # distributed under the License is distributed on an "AS IS" BASIS, # WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. # See the License for the specific language governing permissions and # limitations under the License. from __future__ import absolute_import from __future__ import division import nacl.bindings import nacl.encoding from . import _argon2 ALG = _argon2.ALG_ARGON2ID13 STRPREFIX = nacl.bindings.crypto_pwhash_argon2id_STRPREFIX SALTBYTES = _argon2.SALTBYTES PASSWD_MIN = _argon2.PASSWD_MIN PASSWD_MAX = _argon2.PASSWD_MAX PWHASH_SIZE = _argon2.PWHASH_SIZE BYTES_MIN = _argon2.BYTES_MIN BYTES_MAX = _argon2.BYTES_MAX verify = _argon2.verify MEMLIMIT_MIN = nacl.bindings.crypto_pwhash_argon2id_MEMLIMIT_MIN MEMLIMIT_MAX = nacl.bindings.crypto_pwhash_argon2id_MEMLIMIT_MAX OPSLIMIT_MIN = nacl.bindings.crypto_pwhash_argon2id_OPSLIMIT_MIN OPSLIMIT_MAX = nacl.bindings.crypto_pwhash_argon2id_OPSLIMIT_MAX OPSLIMIT_INTERACTIVE = \ nacl.bindings.crypto_pwhash_argon2id_OPSLIMIT_INTERACTIVE MEMLIMIT_INTERACTIVE = \ nacl.bindings.crypto_pwhash_argon2id_MEMLIMIT_INTERACTIVE OPSLIMIT_SENSITIVE = \ nacl.bindings.crypto_pwhash_argon2id_OPSLIMIT_SENSITIVE MEMLIMIT_SENSITIVE = \ nacl.bindings.crypto_pwhash_argon2id_MEMLIMIT_SENSITIVE OPSLIMIT_MODERATE = \ nacl.bindings.crypto_pwhash_argon2id_OPSLIMIT_MODERATE MEMLIMIT_MODERATE = \ nacl.bindings.crypto_pwhash_argon2id_MEMLIMIT_MODERATE def kdf(size, password, salt, opslimit=OPSLIMIT_SENSITIVE, memlimit=MEMLIMIT_SENSITIVE, encoder=nacl.encoding.RawEncoder): """ Derive a ``size`` bytes long key from a caller-supplied ``password`` and ``salt`` pair using the argon2i memory-hard construct. the enclosing module provides the constants - :py:const:`.OPSLIMIT_INTERACTIVE` - :py:const:`.MEMLIMIT_INTERACTIVE` - :py:const:`.OPSLIMIT_MODERATE` - :py:const:`.MEMLIMIT_MODERATE` - :py:const:`.OPSLIMIT_SENSITIVE` - :py:const:`.MEMLIMIT_SENSITIVE` as a guidance for correct settings. :param size: derived key size, must be between :py:const:`.BYTES_MIN` and :py:const:`.BYTES_MAX` :type size: int :param password: password used to seed the key derivation procedure; it length must be between :py:const:`.PASSWD_MIN` and :py:const:`.PASSWD_MAX` :type password: bytes :param salt: **RANDOM** salt used in the key derivation procedure; its length must be exactly :py:const:`.SALTBYTES` :type salt: bytes :param opslimit: the time component (operation count) of the key derivation procedure's computational cost; it must be between :py:const:`.OPSLIMIT_MIN` and :py:const:`.OPSLIMIT_MAX` :type opslimit: int :param memlimit: the memory occupation component of the key derivation procedure's computational cost; it must be between :py:const:`.MEMLIMIT_MIN` and :py:const:`.MEMLIMIT_MAX` :type memlimit: int :rtype: bytes .. versionadded:: 1.2 """ return encoder.encode( nacl.bindings.crypto_pwhash_alg(size, password, salt, opslimit, memlimit, ALG) ) def str(password, opslimit=OPSLIMIT_INTERACTIVE, memlimit=MEMLIMIT_INTERACTIVE): """ Hashes a password with a random salt, using the memory-hard argon2id construct and returning an ascii string that has all the needed info to check against a future password The default settings for opslimit and memlimit are those deemed correct for the interactive user login case. :param bytes password: :param int opslimit: :param int memlimit: :rtype: bytes .. versionadded:: 1.2 """ return nacl.bindings.crypto_pwhash_str_alg(password, opslimit, memlimit, ALG)